<p>A new β-hydroxydihydrochalcone glycoside named ziganin (<b>1</b>) and a new acylated flavonol glycoside named isorhamnetin-3-<i>O-</i>α-L-(2″,3″-di-<i>O-trans</i>-coumaroyl)-rhamnopyranoside) (<b>2</b>), along with two known flavonoid glycosides, a β-hydroxydihydrochalcone glycoside, a hydroxybenzoic acid derivative, a trinorguaiane type sesquiterpenoid, a triterpenic saponin and a polyol were isolated from the herbs of <i>Pimpinella rhodantha</i> Boiss. Their structures were elucidated on the basis of spectroscopic analyses including 1D-and 2D-NMR, UV, IR, CD, ESI-MS, APCI-MS, HR-ESI-MS techniques. The isolated compounds were evaluated for their antioxidant capacity through the DPPH free-radical scavenging assay and ferrous ion-chelating power test.</p
